Does variables' order matter when doing == and === comparisons? [duplicate]

Answer 1

I think that the following code will explain it:

echo (( 0 == NULL ) ? "0 is null" : "0 is not null")  ."\n";
echo  (0 === NULL) ? "0 is null" : "0 is not null"  ;

it will output:

0 is null
0 is not null

The === operator checks for both value and type, but 0 is a number while NULL is of type NULL

The == operator checks only for value and zero can be casted to "false" or "null" hence the "truthy" that we get for the first line